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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bded51b53ec00de3a54ebf52a0f5b373298afa190e084c0f218da27174a8df52' 
  AND token = 'aln5nkseq9/5SDbhwboXYIOYcp7Nc+Mj2ONBgQKt5DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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