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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb450c43effbeff4160f4bad77f0592f546814a7a91d171edbe54409d49f300' 
  AND token = 'Rm6RteEKhCzdLgaO4O7TDbRLbrnIrG7jO/eouXLO2ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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