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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bd9015c431917c5ad519fb91218102a0f5c0549e201b53f433044b0c25440c' 
  AND token = 'IOWlTSr+EXkoX2frLi/oQU3H2t9cr4ot/LXZfl6nuao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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