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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05962a07e240c145d4d00b408527c06b495c3f15a5f3ea88b2d24c40e7fcf344' 
  AND token = 'F+jyOCPaLt8xjSWBT7N9FTm1luiq5eu10+D37jvCmD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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