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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10c1da75d146147928ac556df3f31410da9408ff79472150f57e7616dec9542' 
  AND token = '55BLaZ+3feqH2JPpsFlT8kulnudmnybarGj67Xd6ZKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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