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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0716aae4a9f00047d3423f9be0265353d066e4b7dbb5f4cf6004182614e1041b' 
  AND token = 'iwYbM9OBTgNo3/VY0ePMpl2UfasaryoA9czCwsFDW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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