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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7469fda6b321640dc71217e0cf89b5ed64ad1a28e432745a034feddca5ebdf9' 
  AND token = 'aCVZvEEpb5VSGfv4RgBkx4ualEXliY6Femhk3EP+HZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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