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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abac9b67086683f3e68cf8e67ad993cdf79ca9fc9549bcaf4bd55886899a07e' 
  AND token = 'mw3v0c6T8wUNvATLhJnJQHs63IXPGbOnWVm+3ND4NPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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