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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcd1b6c36f226c636f088753da5db124703d8cf9b375f46e8fd118eecae8647' 
  AND token = 'R2geiUaz+DwyU93TT64XJz7fcQ2K6QZg+hHLrsjX1Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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