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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a1d6bf976b604f2823e2d3b4ca9e49bc3dd5ce6cfdc271a54910bcf353dbe5' 
  AND token = 'eu1Jk5DVyQthTyt+JnuFOzYiJEjmCDb94uUmer0gdi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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