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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977b0f4ead0a3c8c5a41672804d40079cd5566d9ca232e57061801213cd56382' 
  AND token = 'sIDgqoV5/wKwHlf+c3JWtsVdLoaIiHP6k3beTtCcXTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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