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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d43362a2d7c3ad0e8728fe4db2997045713c5e3401d5fd46267f08d5ab1506' 
  AND token = '+UFb/wQ52LBz1fcbu27ooel/7ixzSCNW3mVAObWGVis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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