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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bec2cec11c9277065efdd25fa2d0058b3796ac02e9cb3ed59960ed91f0f2fb4' 
  AND token = 'TrJLngz6dddCibHONotQFupLY84vF5zMYaGFHPeRTak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}