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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf23c670dae7d3b8613452cd97b4e4f1407c398c308fe358d22501b971655fb' 
  AND token = '2II/q57CAvH3ukQ2oYlIwQ2y0pYeSBxO0VE/MN3i7rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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