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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6ff1ba3e849479782f7bb62e2a698c49b1eb5409fa228601e5a2526b17357f' 
  AND token = '7VpgRlWk8h6CdJvjLexn3atcQeIGPcbc+Ip1thQ0Vjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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