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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7851ef369c0a5b54121ee681802671ca63b5e720962750ecf880a2baf0943f59' 
  AND token = 'oOnIMYgI3XTfKuAbWB0VRiaRK74e9/i4RUHt5suO7IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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