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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb746c158e43cb8b2b129d5830b365f25aef2f43a0e755c6571b138196b976e2' 
  AND token = 'CH8vvPAmq3vnpSzoobewnf90IhokH41KDdairBQwzc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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