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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7f579a35693dafc0bde606b0473e00a50b4695fa125b3472e47ad4511db07d' 
  AND token = '+I3vGeCH5ATphrvS5lBOHzx8UCrkkRDsmgFP1DqdFBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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