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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9f46607e5e0fc12d4c5d354b20e3dd2ca7a114832e3120a78a7e51d1755cdc' 
  AND token = 'MI8O6dlXfh9Yn+UnXJ19Fq6DmxcEuYS34r4GC+Tf1tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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