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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1093617374d81be232a2a776b62d3fff42913a58772e250839ffc9e96a07d4a4' 
  AND token = '70hUeJwPZsI16y9+qxMP4Vcn22y0Q4++ZF6ldEI3x44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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