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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc09b5383c1587395275b8352f384bff797ba6329bc44ed50e4a2e5acfdba20' 
  AND token = 'Q7JuK7buRIHbefegK5M9zfrB1ylkOyvVbtGNV4MnXGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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