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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a9885aace883f8d9bf5d4663c84cee43669f4983a2f306bde3f2869c5398ea' 
  AND token = 'Psg53OrpAabUfLrvBsN4Ekkn2dB6vVeAy9p9CkpgNV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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