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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323e0ea44b0b92035c18440539a0a01a0cdbbf19b5c384e3f4b5cbe99453a623' 
  AND token = 'yF4uJkJ7rbtksVhA1SbIg0PMIMXHSrQwRe3hT803X2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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