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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b341b3e7f5c33be965220eee01e4c1b643969b082338192cb2fcec6643f0bcfb' 
  AND token = '7q0QKVqSzpIIhng33EevEQ2FAvYnJkcSDfftTpHkuy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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