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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0370b2ce88df1a01f029254f48f376138fac647dd9d151bea0d2089ec44fdde6' 
  AND token = 'Np9xuohwLVujPbffseqaUHkmI4iZ2z/BUk7IJXEbTT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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