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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a4dc739c3160b2c4efe0ebe192a43c168e59b193a132195c5ac4fce1b72992' 
  AND token = 'VEB+Ia7R3O/rtJv8q4EI1+cgsxNsy8nrHryxtb69LWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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