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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2292fdd7b7f23b247fec1fac5e8584a2178393b70adfbe8c13f3bc5671b692d' 
  AND token = 'CTMToq2SpP42ezlr6DAzGoqNi3M5NzYKqG4wHSiVFq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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