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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3213214ee860f283262a813ddff0fea8f95f5d9f85f3d389d6d147ea38208a' 
  AND token = 'K+tFPhORFEXpJ5a0oOiF1RzDxA2TCP7NskpIRO1v8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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