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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc3cd0e75afdb55873385a29931c1ca001ce9cc6c316ec7b269035a2b4ae860' 
  AND token = '0F/c+KN2w0+gTG5wh7Q8XV0x12EhTBRJu6xRveyNCHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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