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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60325e0966cfe688df5ec75e49837ea004c14852d093ecc8de7f116b4608f67b' 
  AND token = '7ih/vZ31ApuHmgbJaenmKCmJIKdsGSWptqUkM1fSNPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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