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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd262d19a4f4c309fe4433fd8eefc4730e32a306cbca0970249de8e4d01e90c' 
  AND token = 'mE63Gb0mTxwY4KCXPRZ0DPq2gnciITCuYVr+k3Kn29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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