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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07a5db10d5ad27be01ca3e32c7d2f5671ef1f11176c2d23925e6acc25bf10ae' 
  AND token = 'IfxQcKB1y2KOtUZwnYHEqGK0urzaRwLkwHJbFZNCTUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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