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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f16faab07ccc370b1d478e6b3a1275ec183f19971f5ce834d41fa568565f4a4' 
  AND token = 'oO6pdlfRDXMpOLLcsXZznGzJGbBnro59UTMqFzpJx2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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