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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c02542eb2fda847a829fdc3aadead293e85c1a1ba75d860a5bdae8737d4e1f' 
  AND token = '1q1ThMv4vhkdmOjYKJbbyyolR1/GwLI4tEToqJ8lgB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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