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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f773a0573303939374058e27871f14f0d50c8b3a1743e93a6dcf47492e4309e7' 
  AND token = 'TiqAhRcXwMgPbWTLnR64BjaEE7nwNG5AY4pc+eeXef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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