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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc4914644b87473e713b4d78d97e220a6b10fba55c2c23dccbd322a7be74ef7' 
  AND token = 'p0v2WOSRGwz88/8am8DY7poEaUEAkYzetytr9mVChsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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