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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee7268e98d371f27d20ea434e23a33877681ca82eaa73eb9ec3011b0f7a200c' 
  AND token = 'LS/IKQip5iAiTel1wEiWH3IXJ5+jciwEKzTEBdp6xis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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