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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf0026fde369a11c55694ae77640790f3dbb562cad0babfcc20016fd1f401f3' 
  AND token = 'eqAwjR4EUJnQ2/NFIa9Hza397vSLNkFQYPyTst/ntTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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