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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8c04d8522a8522996f22b76562b57d5991ceb0edd79812d8c60a1b27db2eaa' 
  AND token = 'n9mWUBFiJIql9Rk576ca7oe7muaQEUsgilaYYLB+m1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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