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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea702bac2187a35b0801f3de5f309a9b03c2a0136d67890c701bc4d1d61b822' 
  AND token = 'R+cm1nrDnOR+zZgcm5FpNT7HEf1Nedlm2JQp14enBrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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